Abstract: Based on the five-speed dry dual clutch transmission(DDCT) which is independently developed, the issue of coordinating control between engine and clutch is investigated from the system level in order to adequately reflect the drivers intention and improve the launch performance of car equipped with DCT, and engine speed and clutch delivered torque in the launch process are quantified and corresponding calculation formulas are derived also. Considering the characteristic of physical configuration, four degrees-of-freedom(DOF) launch dynamics equations of DDCT with single intermediate shaft are established, and two-DOF equations of slip-friction phase and one-DOF equation of in-gear stable operation phase are respectively gotten after carrying on simplification. Utilizing the predictive control thoughts and genetic algorithm, target tracing curves of engine speed and vehicle velocity are specified optimally online, slip mode variable structure(SMVS) servo control strategy of launch is designed to track these curves. Launch performance of prototype car with DCT is simulated under different driving conditions on the Matlab/Simulink software platform. The rapid prototyping experiments of SMVS launch strategy are conducted on the hardware-in-the-loop test bench of DCT control unit, which is built up independently. Simulation and test results illustrate that the proposed servo controller of SMVS not only effectively embodies drivers intention and improves the launch performance of DCT prototype car but also has strong robustness to parameters variations of car, it can be applied for the launch control of automated mechanical transmission (AMT) in the meantime.

Key words: Dry dual clutch transmission, Launch, Rapid prototyping experiment, Real-time optimization, Slip mode variable structure control